Aux In

[Type 100]

the cheapest is simply by using mp3 modulator, no modification. saksak mo lang siya sa cigarette lighter, then connect mo siya sa music player mo. actually puedeng isaksak ang usb flash disk at siya na mag play kaya lang you cannot arrange your music selection. FM radio wave ang pasok nya sa HU mo. around 500 petot lang gadget.

Cheapest also means worst sound quality, especially at higher volumes.

The whole point of the aux-in connection is to have a physical wire from the source to the receiver, so as not to lose any sound quality.